One of the purchasing decisions you need to make is whether to buy Upgrade or Full Version. All Upgrade packages require a valid license number of a previous version or an installed copy of a previous version on the end user's hard drive. FullShot 9 Setup program will fail if the end user's PC doesn't meet such a requirement. For users of FullShot V1, V2, V3, and V4 Release 1997, the license number is printed on the program disk label. For FullShot 99 V5, FullShot 6, 7 and 8 users, the license number is on the back of the program CD jewel case or inside of the CD jacket.